摘要
通过水热法合成了1个双核铬配合物[Cr2(OH)2(2-pca)4].3H2O(2-Hpca=2-吡嗪甲酸),并对其进行了X-射线单晶衍射、红外光谱、元素分析、荧光和热的表征及研究。该配合物属于单斜晶系,P21/c空间群。晶体学数据:a=1.566 35(15),b=0.847 70(6),c=1.974 60(18)nm,β=90.645 0(10)°,C20H20Cr2N8O13,Mr=684.44,V=2.621 7(4)nm3,Dc=1.734 g.cm-3,F(000)=1 392,μ=0.913 cm-1,Z=4,最终R=0.044 7,wR=0.112 0用于3 251个可观测点。在晶体结构中,每个铬原子均为六配位,其中来自两分子2-吡嗪甲酸的2个氮原子、2个羧酸基氧原子和2个桥连羟基上的氧原子,呈现畸变的八面体几何构型。
A binuclear chromium complex [Cr2(OH)2(2-pca)4] 3H20 (2-pca=pyrazine-2-carboxylate anion) was hydrothermally prepared and characterized by single crystal X-ray diffraction, FTIR spectra, elemental analysis, luminescence and thermal analysis. It crystallizes in the monoelinic system, space group P21/c, with a=1.566 35(15), b=0.847 70(6), c=1.974 60(18) nm,/3=90.645 0(10)°, C20H20Cr2N8O13, Mr=684.44, V=2.621 7(4) nm3, Dc=1.734 g- cm-3, F(000)=I 392,/x=0.913 cm-1, Z=4, the final R=0.044 7 and wR=O. 112 0 for 3 251 reflections with 1〉2o(1). X-ray diffraction analysis reveals that each Cr(Ⅲ) center is octahedrally coordinated by two nitrogen atoms and two oxygen atoms from two pyrazine-2-carboxylate anion ligands, and another two oxygen atoms from two hydroxyl groups. The two Cr(m) centers are bridged by two/x2-O of OH group. CCDC: 752196.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2012年第4期846-850,共5页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.20671048,21041002)资助项目
关键词
2-吡嗪甲酸
晶体结构
铬配合物
pyrazine-2-carboxylic acid
crystal structure
chromium(Ⅲ) complex